He was given “400 acres in Georgia being part of the plantation whereon I lived, adjoining William Saterwhite” in the will of his father, Dionysius, of 20 March 1780.485 He is listed in the Richmond County Land Court held in 1786 and 1787. 515He was alive on 10 March 1794 when he appeared as Thomas Hamilton's bondsman in the intestate bonds from the courthouse, Appling, Columbia County, Georgia. He had died by 16 October 1799 when he appears as intestate in the intestate bonds from the courthouse, Appling, Columbia County, Georgia.
“Isaiah Wright, born 1748 in Virginia, died 1820 in Georgia, married Rebekah Briscoe on 14 November 1787 in Warren County, Georgia. Isaiah Wright was found murdered on 22 August 1820 at his home in Columbia County, Georgia. Family history tells that Isaiah Wright was murdered because there was a bounty on his head for his part in the Revolutionary War and somebody wanted to collect it. He may have served the Colonies in the American Revolution as a tax collector. Isaiah Wright received 287 acres of land as a bounty for his part in the Revolutionary War in 1785, Washington County, Georgia.
Children born to Isaiah and Rebekah were:
1.5.1. Milton Wright, b1798, in Georgia.
1.5.2. Isaiah Caswell Wright, married Mary Polly Neal, born abt 1805
”485
The will of his brother Albert of 1794 mentions his brothers Abednego, Meshack, Shadrack, Isaiah, Habakkuk, and his sisters Charity Shultz who later married a John Cotton, Peace Brown who later married Abner Willingham, Naomi Mims, Concord Hamilton, and Elizabeth Penny Tindall.

Are these two different Isaiahs? The death dates are too at variance. Check Columbia County records.

“Isaiah Wright’s wife, Rebekah Briscoe, came from a long line of prominent physicians from the Maryland Colony. The first of her line to come to the American Colonies was Dr. John Briscoe, who was born around 1612 in Crofton, Cumberland, England and died around 1699 in St. Marys, Maryland. His wife was Elizabeth Dubois, who was born around 1612 in France. They were married around 1637. Dr. John Briscoe arrived on the ship Ark and Dove on 22 November 1633 and record 25 March 1634. Dr. John Briscoe, Surgeon and Henry Briscoe were listed with the twenty Gentlemen with Gov. Leonard Calvert.”485
She was alive on 16 Oct 1799 when she appears as her husband's widow in the intestate bonds from the courthouse, Appling, Columbia County, Georgia.

Ancestry.com says they were married in Richmond County.